package com.apes.framework.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Created by lishikun on 2021/3/15 16:14
 */
public class SHA256 {
    /**
      * 利用java原生的类实现SHA256加密
      * @param str 加密后的报文
      * @return
      */
    public static String getSHA256(String str){
        MessageDigest messageDigest;
        String encodestr = "";
        try { 
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes("UTF-8"));
            encodestr = byte2Hex(messageDigest.digest()); 
        } catch (NoSuchAlgorithmException e) { 
            e.printStackTrace(); 
        } catch (UnsupportedEncodingException e) { 
            e.printStackTrace(); 
        }
        return encodestr; 
    }
    /**
  * 将byte转为16进制
  * @param bytes
  * @return
  */
    private static String byte2Hex(byte[] bytes){
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i=0;i<bytes.length;i++){
        temp = Integer.toHexString(bytes[i] & 0xFF);
        if (temp.length()==1){
        //1得到一位的进行补0操作
            stringBuffer.append("0");
        }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }



}
